On the CTC sub-thread.
In the radio trades we used CTC to clean the mess from equipment when oil filled capacitors and transformers burst.
During the period Oct 62 to Oct 64, while I was in the Akrotiri Electronics Centre, it suddenly became forbidden and we had to use unleaded petrol.
Unleaded petrol didn't work! It didn't clean, it just diluted the oil and left a greasy residue.